document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=105738>Question 105738</A>: <I><SPAN STYLE=\"word-break: break-all;\"> List all the prime numbers between 55-75. I am confused about Prime Numbers, exactly what are they in plain ole english could someone please explain. Thanks, Zack </SPAN>\n" );
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document.write( "Let's think it SO SIMPLY. prime numbers are numbers that can only be divided by one. Take an example, like 7. Do you know any numbers other than 1 and 7 that is divided by? no. there is no such number. But if you take 4, which is composite, you have more than just 1 and 4. it's also 2.\r<BR>\n" );
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document.write( "Also, ALL even numbers are composite. It is so because even numbers can be divided by 2.<BR>\n" );
document.write( "Any number that ends with 0 or 5 is composite. they are divisible by 5.\r<BR>\n" );
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document.write( "So let's go from 55-75:\r<BR>\n" );
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document.write( "55) Nope. 55 can also be by 5 and 11. Let's skip 55,60,65,60 and 75. they are divisible by 5.<BR>\n" );
document.write( "56) Even. so no.<BR>\n" );
document.write( "57) You might think 57 is prime, but there is a special way to know if this is a prime or composite: use a good old-fashioned 3 divisible tricks: Add the each digit of the number up, so in here, 5 and 7. If the number added is divisible by 3, then it is divisible by 3. So 5 + 7 = 12. 12 can be divided by 3 evenly, yes? so this is not prime.<BR>\n" );
document.write( "58) Even. (Let's skip 60,62,64,66,68,70,72 and 74. they're all evens.<BR>\n" );
document.write( "59) Yes! this is a prime number, because 59 can only be divided by 1 and 59.<BR>\n" );
document.write( "61) Yes! this is a prime number, because 61 can only be divided by 1 and 61.<BR>\n" );
document.write( "63) Not a chance. 9 times 7 is 63.<BR>\n" );
document.write( "67) Yes! this is a prime number, because 67 can only be divided by 1 and 67.<BR>\n" );
document.write( "69) Nope. Remember 3 fivisible trick? 6 + 9 = 15, and 15 is divisible by 3.<BR>\n" );
document.write( "71) Yes! this is a prime number, because 71 can only be divided by 1 and 71.<BR>\n" );
document.write( "73) Yes! this is a prime number, because 73 can only be divided by 1 and 73.\r<BR>\n" );
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document.write( "So the following list is:<BR>\n" );
document.write( "59,61,67,71,73\r<BR>\n" );
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document.write( "Alright. Good luck.<BR>\n" );
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